Re: I compared with RPG, and there is an apparent disagreement

Posted by David Aiken (A) on February 2, 2006 at 03:14:19

In Reply to: I compared with RPG, and there is an apparent disagreement posted by PranaBindu on February 1, 2006 at 23:03:25:

If the top of each piece is angled slightly, with an appropriate orientation of angles, then you would get a bit more effective diffusion than you would with flat tops on each piece. I think the calculator assumes flat tops and I don't know whether the RPG product has angles.

In any event, the figure the calculator gives is theoretical and I suspect that the RPG figure is an actual test result. Acoustic tests sometimes return odd results. Theoretically you can't have an absorption coefficient greater than 1 which represents complete absorption but some materials when tested give results greater than 1 due to the effects of things like edge diffraction. There can be some odd things come out in the results of acoustic tests and the RPG quoted diffusion coefficient may "benefit" from such oddities.

David Aiken

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Follow Ups Full Thread

Topic - DIY skyline diffuser - PranaBindu 10:03:35 01/31/06 (16)

Fire risk - Chris_F 06:30:43 02/02/06 (0)

RE Styrofoam - Jon Risch 17:40:14 01/31/06 (3)

RPG design is puzzling - PranaBindu 23:17:49 02/01/06 (2)

Re: RPG design is puzzling - Jon Risch 10:19:52 02/02/06 (1)

Hong Kong opera house - jnorv 16:17:45 02/02/06 (0)

Update and rough calculations - PranaBindu 10:28:50 01/31/06 (8)

Save yourself some energy (and brain cells), web-based skyline diffuser calculator.... - darkmoebius 01:35:53 02/01/06 (2)

I compared with RPG, and there is an apparent disagreement - PranaBindu 23:03:25 02/01/06 (1)

Re: I compared with RPG, and there is an apparent disagreement - David Aiken 03:14:19 02/02/06 (0)

Re: Update and rough calculations - bradp 14:03:52 01/31/06 (4)

That's one - PranaBindu 15:55:54 01/31/06 (3)

cheap mitre-box and a serrated bread knife work great for styrofoam. nt - snkby 20:18:44 02/01/06 (0)

Cutting syrofoam - Don Bunce 08:20:59 02/01/06 (0)

Make that two!! - Julien43 07:17:14 02/01/06 (0)

Re: DIY skyline diffuser - Sopor 10:19:49 01/31/06 (1)

not stiff or "random" enough - PranaBindu 10:31:47 01/31/06 (0)

Follow Ups

Re: I compared with RPG, and there is an apparent disagreement - David Aiken 03:14:19 02/02/06 (0)

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